From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Technical memorandum detailing proposed engine modifications for increased power output, specifically regarding exhausts, pistons, and camshafts.
| Identifier | ExFiles\Box 65a\3\ scan0281 | |
| Date | 7th April 1931 | |
| Hs{Lord Ernest Hives - Chair}/Lov{Mr Lovesey}2/ADL7.4.31 contd. -3- (a) Power with open exhausts or short stub pipes. (b) Power with standard silencer C/O open and shut - only at high speeds - above 2500 R.P.M. (c) Three down pipes into silencer. (5) Piston Friction. Put in hand a set of unsplit pistons ground to the equivalent clearances as on the "F" aero engine. Get comparative power curves with these and standard. Then can we gain power with only three piston rings - two pressure and one perfect circle scraper. (6) Camshafts. We shall increase the lift and generally copy our high lift camshaft as used on 6/1 modified S/C. F.{Mr Friese} - A.C.L. has this in hand. Would you please proceed right away with the items given above. Cylinder head modification and piston modification should be put in hand first. Then look into limits of valve lift and springs. While we are waiting we should take as a basis the standard power curves with standard engine. Repeat with open exhaust on stub pipes. We think our high power experiments should be done with open exhaust, then when we have the best apply the silencer and improve that for power output. HS{Lord Ernest Hives - Chair}/Lov.{Mr Lovesey} | ||